KR20190126987A - Flexible heat dissipation sheet using artificial graphite sheet and manufacturing method thereof - Google Patents

Flexible heat dissipation sheet using artificial graphite sheet and manufacturing method thereof Download PDF

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KR20190126987A
KR20190126987A KR1020180050986A KR20180050986A KR20190126987A KR 20190126987 A KR20190126987 A KR 20190126987A KR 1020180050986 A KR1020180050986 A KR 1020180050986A KR 20180050986 A KR20180050986 A KR 20180050986A KR 20190126987 A KR20190126987 A KR 20190126987A
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heat dissipation
sheet
artificial graphite
metal
layer
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KR1020180050986A
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Korean (ko)
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KR102328933B1 (en
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곽민기
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전자부품연구원
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00Constructional details common to different types of electric apparatus
    • H05K7/20Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
    • H05K7/20436Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing
    • H05K7/20445Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing the coupling element being an additional piece, e.g. thermal standoff
    • H05K7/20472Sheet interfaces
    • H05K7/20481Sheet interfaces characterised by the material composition exhibiting specific thermal properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/26Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/005Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile
    • B32B9/007Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile comprising carbon, e.g. graphite, composite carbon
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/041Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073Shielding materials
    • H05K9/0081Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0084Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00Condition, form or state of the layers or laminate
    • B32B2305/38Meshes, lattices or nets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/30Properties of the layers or laminate having particular thermal properties
    • B32B2307/302Conductive
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00Electrical equipment
    • B32B2457/08PCBs, i.e. printed circuit boards

Abstract

Proposed are a flexible heat dissipation sheet using an artificial graphite sheet which prevents the layer separation of the artificial graphite sheet, improves the flexibility of the heat dissipation sheet, and additionally has an electromagnetic shielding function, and a method for manufacturing the same. The flexible heat dissipation sheet using an artificial graphite sheet according to the present invention is a mesh-shaped artificial graphite sheet. The flexible heat dissipation sheet includes a heat dissipation layer having excellent heat transfer characteristics in the horizontal direction and filled with metal paste of an organic material including a first metal particle in a mesh space; a metal thick film layer formed on one surface of the heat dissipation layer; an adhesive layer including an adhesive including a second metal particle having excellent heat transfer characteristics on the metal thick film layer; and an insulating adhesive layer formed on the other surface of the heat dissipation layer.

Description

인조 흑연 시트를 이용한 유연성 방열시트 및 그의 제조방법{Flexible heat dissipation sheet using artificial graphite sheet and manufacturing method thereof}Flexible heat dissipation sheet using artificial graphite sheet and manufacturing method

본 발명은 인조 흑연 시트를 이용한 유연성 방열시트 및 그의 제조방법에 관한 것으로, 상세하게는 인조 흑연 시트의 층 분리를 방지하고, 방열시트의 유연성을 개선하고, 부가적으로 전자파 차폐 기능을 가지는 인조 흑연 시트를 이용한 유연성 방열시트 및 그의 제조방법에 관한 것이다.The present invention relates to a flexible heat dissipation sheet using an artificial graphite sheet and a method of manufacturing the same, and in particular, to prevent layer separation of the artificial graphite sheet, improve flexibility of the heat dissipation sheet, and additionally, artificial graphite having an electromagnetic shielding function. It relates to a flexible heat dissipation sheet using a sheet and a method of manufacturing the same.

일반적으로 방열시트는 각종 전자기기 내지 전자소자에서 열을 확산시키기 위한 열 전달 매체로 활용되는 부품이다. 이러한 방열시트는 두께방향에 비해 면방향의 열전도율이 큰 재료(열이방성 재료)를 사용하여 제조하는 것이 일반적이었으며, 이러한 재료의 대표적인 예로는 흑연이 있다. 흑연을 이용한 방열시트는 천연흑연을 필름형태로 제작한 천연 방열시트, 유기물 필름을 태운 인조 흑연 방열시트 등이 있다. 이와 같은 흑연시트로 방열체를 제조하면, 시트의 두께방향의 열전도율에 비해 면방향의 열전도율이 상대적으로 크기 때문에 열의 확산이동이 효율적이다. In general, the heat dissipation sheet is a component utilized as a heat transfer medium for diffusing heat in various electronic devices or electronic devices. Such a heat dissipation sheet was generally manufactured using a material (thermally anisotropic material) having a large thermal conductivity in the plane direction compared to the thickness direction, and a representative example of such a material is graphite. The heat dissipation sheet using graphite includes a natural heat dissipation sheet made of natural graphite in the form of a film, and an artificial graphite heat dissipation sheet carrying an organic film. When the heat dissipating body is manufactured from such a graphite sheet, heat transfer in the plane direction is more efficient than the thermal conductivity in the thickness direction of the sheet.

그런데 최근 밀폐형 전자기기(예컨대 스마트폰, 태블릿피씨 등)에 적용되는 방열체의 경우에는 면방향의 열전도율뿐만 아니라 수직방향의 열전도율도 향상시키기를 요구 받고 있으므로, 수평 및 수직 방향의 열전도율이 우수한 방열체를 제조하고자 하는 시도가 많이 이루어지고 있다. However, in recent years, heat radiators applied to enclosed electronic devices (eg, smartphones, tablet PCs, etc.) have been required to improve not only thermal conductivity in the plane direction but also thermal conductivity in the vertical direction, and thus have excellent heat conductivity in the horizontal and vertical directions. Many attempts have been made to manufacture the same.

또한, 유연한 기기에 사용하기 위해서는 방열시트 자체의 유연성이 요구되나 수평 방향의 열 전달 특성이 우수한 인조 흑연 방열 시트의 경우 방열체의 특성상 유연성을 나타내지 않아 유연기기에의 사용은 제한이 있어왔다. In addition, the flexibility of the heat dissipation sheet itself is required in order to use it in a flexible device, but the artificial graphite heat dissipation sheet having excellent heat transfer characteristics in the horizontal direction does not exhibit flexibility in the characteristics of the heat dissipator, and thus the use of the flexible device has been limited.

본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, 본 발명의 목적은, 인조 흑연 시트의 층 분리를 방지하고, 방열시트의 유연성을 개선하고, 부가적으로 전자파 차폐 기능을 가지는 인조 흑연 시트를 이용한 유연성 방열시트 및 그의 제조방법을 제공함에 있다. The present invention has been made to solve the above problems, an object of the present invention, to prevent the separation of the layer of artificial graphite sheet, improve the flexibility of the heat dissipation sheet, and additionally artificial graphite sheet having an electromagnetic shielding function To provide a flexible heat dissipation sheet and a method of manufacturing the same.

상기 목적을 달성하기 위한 본 발명의 일 실시예에 따른 인조 흑연 시트를 이용한 유연성 방열시트는 메쉬 형상의 인조 흑연 시트로서, 메쉬 내부공간이 제1금속입자를 포함하는 유기물질인 금속페이스트로 채워진 수평방향으로 열전달 특성이 우수한 방열층; 방열층의 일면에 형성된 금속후막층; 금속후막층 상의 열전달 특성이 우수한 제2금속입자를 포함하는 접착제를 포함하는 접착층; 및 방열층의 타면에 형성된 절연성 접착층;을 포함한다. The flexible heat dissipation sheet using the artificial graphite sheet according to an embodiment of the present invention for achieving the above object is a mesh-shaped artificial graphite sheet, the mesh inner space is filled with a metal paste which is an organic material containing the first metal particles Heat dissipation layer excellent in heat transfer characteristics in the direction; A metal thick film layer formed on one surface of the heat dissipation layer; An adhesive layer comprising an adhesive including a second metal particle having excellent heat transfer characteristics on the metal thick film layer; And an insulating adhesive layer formed on the other surface of the heat dissipation layer.

방열층의 메쉬의 선폭은 0.5 내지 3mm이고, 방열층의 메쉬의 내부폭은 0.5 내지 3mm일 수 있다. The line width of the mesh of the heat dissipation layer is 0.5 to 3mm, the inner width of the mesh of the heat dissipation layer may be 0.5 to 3mm.

제1금속입자는 Cu입자, Al입자, Ni가 코팅된 Cu입자, 및 Cu 또는 Ni가 코팅된 폴리머입자 중 하나 또는 이들의 혼합입자를 포함할 수 있다. The first metal particles may include one of Cu particles, Al particles, Cu particles coated with Ni, and one or a mixture of Cu or Ni coated polymer particles.

제1금속입자 및 제2금속입자는 동일할 수 있다. The first metal particle and the second metal particle may be the same.

접착층은 두께가 5 내지 30㎛일 수 있다. The adhesive layer may have a thickness of 5 to 30 μm.

절연성 접착층은 두께가 5 내지 25㎛일 수 있다. The insulating adhesive layer may have a thickness of 5 to 25 μm.

금속후막층은 Al, Cu 및 Ni 중 적어도 하나의 금속을 포함할 수 있다. The metal thick film layer may include at least one metal of Al, Cu, and Ni.

본 발명의 다른 측면에 따르면, 인조 흑연 시트를 메쉬 형상으로 형성하여 수평방향 방열층을 형성하는 단계; 메쉬 내부공간을 제1금속입자를 포함하는 유기물질인 금속페이스트로 채우면서 금속후막층을 형성하는 단계; 금속후막층 상에 제2금속입자를 포함하는 접착제를 포함하는 접착층을 형성하는 단계; 및 방열층의 타면에 절연성 접착층을 형성하는 단계;를 포함하는 인조 흑연 시트를 이용한 유연성 방열시트 제조방법이 제공된다.According to another aspect of the present invention, forming an artificial graphite sheet in a mesh shape to form a horizontal heat radiation layer; Forming a metal thick film layer by filling a mesh internal space with a metal paste, which is an organic material including first metal particles; Forming an adhesive layer comprising an adhesive including a second metal particle on the metal thick film layer; And forming an insulating adhesive layer on the other surface of the heat dissipating layer. A method of manufacturing a flexible heat dissipating sheet using an artificial graphite sheet is provided.

본 발명의 실시예들에 따르면, 인조 흑연 방열시트를 메쉬 모양으로 형성하여 인조 흑연 시트의 유연성을 높이고, 메쉬 내부 공간이 금속입자를 포함한 유기물질인 금속페이스트로 채워짐으로써 인조 흑연 시트의 내구성과 층 분리를 방지하고, 방열층 상에 금속 입자를 포함한 유기물질을 사용하여 금속후막을 형성함으로써 수평 수직 열 전달을 개선하고, 부가적으로 전자파 차폐기능을 가지는 방열시트를 얻을 수 있는 효과가 있다. According to the embodiments of the present invention, the artificial graphite sheet is formed in a mesh shape to increase the flexibility of the artificial graphite sheet, and the inner space of the mesh is filled with metal paste, which is an organic material including metal particles, so that the durability and layer of the artificial graphite sheet Preventing separation, forming a metal thick film using an organic material including metal particles on the heat dissipation layer has the effect of improving horizontal and vertical heat transfer, and additionally obtain a heat dissipation sheet having an electromagnetic shielding function.

또한, 수평방향 방열특성이 우수한 인조 흑연 시트를 메쉬 모양으로 형성하고, 메쉬 내부에 금속입자를 포함한 유기물질인 금속페이스트를 위치시켜 열원으로부터 전달된 열전자가 금속 입자을 통하여 메쉬 형상의 인조 흑연 메쉬 단면을 통하여 열전자를 이동시키므로 수평방향으로 우수한 방열특성을 나타내는 방열시트를 얻을 수 있는 효과가 있다. In addition, an artificial graphite sheet having excellent horizontal heat dissipation characteristics is formed in a mesh shape, and a metal paste, which is an organic material including metal particles, is placed inside the mesh, so that hot electrons transferred from a heat source can form a cross section of the artificial graphite mesh having a mesh shape through the metal particles. Since the thermal electrons are moved through, there is an effect to obtain a heat dissipation sheet exhibiting excellent heat dissipation characteristics in the horizontal direction.

도 1 내지 도 5는 본 발명의 일실시예에 따른 인조 흑연 시트를 이용한 유연성 방열시트의 제조방법에 제공되는 도면들이다.
도 6은 본 발명의 일실시예에 따른 메쉬 형상의 인조 흑연 시트를 도시한 도면이고, 도 7은 도 6의 확대도이다.
1 to 5 are views provided in a method of manufacturing a flexible heat dissipation sheet using an artificial graphite sheet according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating an artificial graphite sheet having a mesh shape according to an embodiment of the present invention, and FIG. 7 is an enlarged view of FIG. 6.

이하, 첨부된 도면을 참조하여 본 발명의 실시형태를 설명한다. 그러나, 본 발명의 실시형태는 여러 가지 다른 형태로 변형될 수 있으며, 본 발명의 범위가 이하 설명하는 실시형태로 한정되는 것은 아니다. 본 발명의 실시형태는 당업계에서 통상의 지식을 가진 자에게 본 발명을 보다 완전하게 설명하기 위해서 제공되는 것이다. 첨부된 도면에서 특정 패턴을 갖도록 도시되거나 소정두께를 갖는 구성요소가 있을 수 있으나, 이는 설명 또는 구별의 편의를 위한 것이므로 특정패턴 및 소정두께를 갖는다고 하여도 본 발명이 도시된 구성요소에 대한 특징만으로 한정되는 것은 아니다.Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. In the accompanying drawings, there may be a component having a specific pattern or having a predetermined thickness, but this is for convenience of description or distinction. It is not limited only.

도 1 내지 도 5는 본 발명의 일실시예에 따른 인조 흑연 시트를 이용한 유연성 방열시트의 제조방법에 제공되는 도면들이다. 본 발명에 따라 제조되는 유연성을 갖고, 부가적으로 전자파 차폐기능을 갖는 인조 흑연 시트를 이용한 유연성 방열시트는 메쉬 형상의 인조 흑연 시트(111)로서, 메쉬 내부공간이 제1금속입자를 포함하는 유기물질인 금속페이스트(112)로 채워진 수평방향으로 열전달 특성이 우수한 방열층(110); 방열층(110)의 일면에 형성된 금속후막층(120); 금속후막층(120) 상의 열전달 특성이 우수한 제2금속입자를 포함하는 접착제를 포함하는 접착층(130); 및 방열층(110)의 타면에 형성된 절연성 접착층(140);을 포함한다. 1 to 5 are views provided in a method of manufacturing a flexible heat dissipation sheet using an artificial graphite sheet according to an embodiment of the present invention. Flexible heat dissipation sheet using an artificial graphite sheet having flexibility and additionally electromagnetic shielding function manufactured according to the present invention is a mesh-shaped artificial graphite sheet 111, the mesh inner space containing the first metal particles A heat dissipation layer 110 having excellent heat transfer characteristics in a horizontal direction filled with the metal paste 112 as a material; A metal thick film layer 120 formed on one surface of the heat dissipation layer 110; An adhesive layer 130 including an adhesive including second metal particles having excellent heat transfer characteristics on the metal thick film layer 120; And an insulating adhesive layer 140 formed on the other surface of the heat dissipation layer 110.

본 발명에 따른 유연성을 갖고, 부가적으로 전자파 차폐기능을 갖는 인조 흑연 시트를 이용한 유연성 방열시트는 방열기능을 갖는 방열층(110)을 포함한다. 방열층(110)은 수평 방향으로 우수한 방열 특성을 가지는 메쉬 모양의 인조흑연과 금속 입자가 포함된 유기물질인 금속페이스트가 메쉬 공간을 채운 형태로 유기물질 속의 금속입자의 함량은 유연성과 내구성을 고려하여 조정될 수 있다. The flexible heat dissipation sheet using the artificial graphite sheet having flexibility according to the present invention and additionally having an electromagnetic shielding function includes a heat dissipation layer 110 having a heat dissipation function. The heat dissipation layer 110 is a form in which a metal paste, which is an organic material including mesh-shaped artificial graphite and metal particles, has excellent heat dissipation characteristics in a horizontal direction, and fills a mesh space. Can be adjusted.

본 발명에 따르면, 수평방향 방열층(110)은 메쉬 형상의 인조 흑연시트(111) 와 금속 입자가 포함된 유기물질 즉 금속페이스트(112)로 형성된다(도 1). 수평방향 방열층(110)을 구성하는 인조 흑연 시트는 프레스를 이용한 타발 공정과 같은 일반적인 공정에 의해 메쉬 형상이 형성될 수 있으며, 그 이외의 방법으로 메쉬 형상이 형성될 수 있다. 수평방향 방열층(110)이 메쉬 형태로 가공된 인조 흑연시트(111)와 금속 입자를 포함한 유기물질로 구성된 금속페이스트(112)로 형성됨으로써 유연성이 증가된다. According to the present invention, the horizontal heat dissipation layer 110 is formed of an organic material, that is, a metal paste 112, including a mesh-like artificial graphite sheet 111 and metal particles (FIG. 1). The artificial graphite sheet constituting the horizontal heat dissipation layer 110 may be formed in a mesh shape by a general process such as a punching process using a press, and the mesh shape may be formed by other methods. The horizontal heat dissipation layer 110 is formed of a metallic graphite 112 formed of an organic material including metal particles and artificial graphite sheet 111 processed in a mesh form, thereby increasing flexibility.

이렇게 메쉬 형상으로 형성된 인조흑연과 금속입자를 포함한 유기물질인 금속페이스트로 구성된 수평방향 방열층(110)의 메쉬 내부 공간에 형성된 금속페이스트(112)과 동일한 물질 또는 금속 혼합비가 다른 물질로 구성된 금속후막층(120)을 방열층(110) 상부에 형성한다(도 2). 또는 방열층(110)의 메쉬 공간 내부에 형성된 금속페이스트(112)와 방열층(110)상부에 형성된 금속후막층(120)에 형성된 금속페이스트가 동일한 금속혼합비를 가질 때에는 단일 공정으로 형성할 수 있다. The metal thick film made of the same material as the metal paste 112 formed in the mesh inner space of the horizontal heat dissipation layer 110 composed of the metal paste, which is an organic material including the artificial graphite and the metal particles, formed in the mesh shape or having a different metal mixing ratio. The layer 120 is formed on the heat dissipation layer 110 (FIG. 2). Alternatively, when the metal paste 112 formed in the mesh space of the heat dissipation layer 110 and the metal paste formed on the metal thick film layer 120 formed on the heat dissipation layer 110 have the same metal mixture ratio, the metal paste 112 may be formed in a single process. .

금속후막층(120)은 전자파차폐기능을 나타내어 본 발명에 따른 유연성을 갖는 방열시트는 방열특성에 추가하여 전자파차폐기능을 갖는다. 금속후막층(120)은 전자파를 차폐할 수 있는 금속을 포함하는 것이 바람직하다. 금속으로는 구리, 알루미늄, 니켈, 금, 은 및 이들의 합금 중에서 선택될 수 있으며, 전자파 차폐성능과 열전도율이 모두 우수한 것을 사용하면 전자파차폐기능을 갖는 방열시트의 방열특성을 보조할 수 있다. The metal thick film layer 120 exhibits an electromagnetic shielding function, so that the heat dissipation sheet having flexibility according to the present invention has an electromagnetic shielding function in addition to the heat radiation characteristics. The metal thick film layer 120 preferably includes a metal capable of shielding electromagnetic waves. The metal may be selected from copper, aluminum, nickel, gold, silver, and alloys thereof, and the use of those having excellent electromagnetic shielding performance and thermal conductivity may assist the heat radiation characteristics of the heat radiation sheet having the electromagnetic shielding function.

금속후막층(120) 상에는 금속입자를 포함하는 접착제를 이용하여 접착층(130)이 형성되고(도 3), 수평방향 방열층(110) 타면에는 절연성 접착층(140)이 형성된다(도 4). An adhesive layer 130 is formed on the metal thick film layer 120 using an adhesive including metal particles (FIG. 3), and an insulating adhesive layer 140 is formed on the other surface of the horizontal heat dissipation layer 110 (FIG. 4).

금속입자를 포함한 접착층(130)은 열전달을 나타내는 접착층으로서, 접착제 물질에 열전달 특성이 우수한 입자가 혼합된 형태이다. 열전달 특성이 우수한 금속입자는 Cu입자, Ni가 코팅된 Cu입자, Cu 또는 Ni가 코팅된 폴리머입자 중 적어도 하나를 포함할 수 있다. 열전달 금속입자의 크기는 1내지 20㎛일 수 있다. The adhesive layer 130 including the metal particles is an adhesive layer that exhibits heat transfer, in which particles having excellent heat transfer characteristics are mixed with the adhesive material. The metal particles having excellent heat transfer properties may include at least one of Cu particles, Ni coated Cu particles, Cu, or Ni coated polymer particles. The size of the heat transfer metal particles may be 1 to 20㎛.

마지막으로 금속입자를 포함한 접착층(130) 및 절연성 접착층(140)에는 각각 보호층(151, 152)이 형성되어 유연성을 갖는 방열시트의 외부를 보호한다(도 5). Finally, protective layers 151 and 152 are formed on the adhesive layer 130 and the insulating adhesive layer 140 including the metal particles, respectively, to protect the exterior of the heat radiation sheet having flexibility (FIG. 5).

본 발명에 따른 우수한 유연성을 갖는 방열시트는 메쉬 형상으로서, 메쉬 내부공간에 금속입자를 포함한 유기물질인 금속페이스트가 채워진 수평방향 방열층(110); 수평방향 방열층(110)의 일면에 형성된 금속후막층(120); 금속후막층(120) 상의 금속 입자를 포함하는 열전도성 접착층(130); 및 수평방향 방열층(110)의 타면에 형성된 절연성 접착층(140);을 포함한다. 우수한 유연성을 갖는 방열시트는 열전도 특성이 우수한 금속입자를 포함한 접착층(130) 및 절연성 접착층(140) 상에 각각 보호층(151, 152)을 더 포함할 수 있다. The heat dissipation sheet having excellent flexibility according to the present invention has a mesh shape, the horizontal heat dissipation layer 110 filled with a metal paste, which is an organic material including metal particles, in a mesh inner space; A metal thick film layer 120 formed on one surface of the horizontal heat dissipation layer 110; A thermally conductive adhesive layer 130 including metal particles on the metal thick film layer 120; And an insulating adhesive layer 140 formed on the other surface of the horizontal heat dissipation layer 110. The heat dissipation sheet having excellent flexibility may further include protective layers 151 and 152 on the adhesive layer 130 and the insulating adhesive layer 140 including the metal particles having excellent thermal conductivity.

본 실시예의 방열시트(100)는 금속후막층(120)의 두께는 3내지 20㎛이고, 열전달 특성이 우수한 금속입자를 포함한 접착층(130)은 두께가 3 내지 30㎛이며, 절연성 접착층(140)은 두께가 3 내지 25㎛일 수 있다. In the heat dissipation sheet 100 of the present embodiment, the thickness of the metal thick film layer 120 is 3 to 20 μm, and the adhesive layer 130 including metal particles having excellent heat transfer characteristics has a thickness of 3 to 30 μm, and the insulating adhesive layer 140. Silver thickness may be 3 to 25 μm.

도 6은 본 발명의 일실시예에 따른 메쉬 형상의 인조 흑연 시트를 도시한 도면이고, 도 7은 도 6의 확대도이다. 수평방향 방열층(110)은 메쉬형상의 인조 흑연 과 메쉬 공간 내부를 금속입자를 포함한 유기물질인 금속페이스트로 구성된다.6 is a view showing a mesh-like artificial graphite sheet according to an embodiment of the present invention, Figure 7 is an enlarged view of FIG. The horizontal heat dissipation layer 110 is composed of a mesh-like artificial graphite and a metal paste which is an organic material including metal particles in the mesh space.

메쉬의 선폭(W)은 0.5 내지 3mm이고, 메쉬의 내부폭(D)은 0.5 내지 3mm일 수 있다. 메쉬 공간이 너무 넓게 형성되면 유연성과 내구성은 증가되나 수평 방향 방열특성이 약해질 수 있고, 메쉬 공간이 너무 작으면 수평 방향 방열 특성은 우수하나 유연성과 내구성이 떨어진다.  The line width W of the mesh may be 0.5 to 3 mm, and the inner width D of the mesh may be 0.5 to 3 mm. If the mesh space is formed too wide, flexibility and durability may be increased, but the horizontal heat dissipation characteristics may be weakened. If the mesh space is too small, the horizontal heat dissipation characteristics may be excellent, but the flexibility and durability may be inferior.

메쉬 공간은 인조 흑연 시트에 복수개가 서로 이격되어 형성된다. 메쉬공간의 평면형상은 도 7에서와 같이 사각형이거나, 또는 6각형, 팔각형, 삼각형일 수 있고 이는 한정되지 않는다. A plurality of mesh spaces are formed on the artificial graphite sheet spaced apart from each other. The planar shape of the mesh space may be square as shown in FIG. 7, or may be hexagonal, octagonal or triangular, but is not limited thereto.

상술한 바와 같이, 본 발명의 실시예들에 따른 우수한 유연 특성을 갖는 방열시트는 메쉬 형상의 인조 흑연과 금속입자를 포함한 유기물질인 금속페이스트로 형성되어 유연성이 증가된다. 또한, 메쉬 모양의 인조 흑연 시트의 메쉬 공간을 금속입자를 포함한 유기물질인 금속페이스트로 채움으로써 인조 흑연 시트의 층 분리를 방지할 수 있고, 금속입자를 통하여 메쉬 단면으로 열을 전달함으로 수평방향의 열전달 특성을 개선할 수 있다. 또한 방열층 상에 금속입자를 포함한 금속 페이스트 후막을 형성함으로 열전달 특성과 전자파 차폐 특성을 가지는 방열시트가 형성된다. As described above, the heat dissipation sheet having excellent flexible properties according to the embodiments of the present invention is formed of a metal paste, which is an organic material including artificial graphite and metal particles in a mesh shape, thereby increasing flexibility. In addition, by filling the mesh space of the mesh-like artificial graphite sheet with a metal paste, which is an organic material including metal particles, it is possible to prevent layer separation of the artificial graphite sheet and to transfer heat to the mesh cross section through the metal particles in the horizontal direction. It is possible to improve heat transfer characteristics. In addition, by forming a metal paste thick film including metal particles on the heat dissipation layer, a heat dissipation sheet having heat transfer characteristics and electromagnetic wave shielding characteristics is formed.

이상, 본 발명의 실시예들에 대하여 설명하였으나, 해당 기술 분야에서 통상의 지식을 가진 자라면 특허청구범위에 기재된 본 발명의 사상으로부터 벗어나지 않는 범위 내에서, 구성 요소의 부가, 변경, 삭제 또는 추가 등에 의해 본 발명을 다양하게 수정 및 변경시킬 수 있을 것이며, 이 또한 본 발명의 권리범위 내에 포함된다고 할 것이다.As described above, embodiments of the present invention have been described, but those skilled in the art may add, change, delete, or add elements within the scope not departing from the spirit of the present invention described in the claims. The present invention may be modified and changed in various ways, etc., which will also be included within the scope of the present invention.

110: 방열층
111: 인조 흑연 시트
112: 금속페이스트
120: 금속후막층
130: 접착제를 포함하는 접착층
140: 절연성 접착층
151, 152: 보호층
110: heat dissipation layer
111: artificial graphite sheet
112: metal paste
120: metal thick film layer
130: adhesive layer comprising an adhesive
140: insulating adhesive layer
151, 152: protective layer

Claims (8)

메쉬 형상의 인조 흑연 시트로서, 메쉬 내부공간이 제1금속입자를 포함하는 유기물질인 금속페이스트로 채워진 수평방향으로 열전달 특성이 우수한 방열층;
방열층의 일면에 형성된 금속후막층;
금속후막층 상의 열전달 특성이 우수한 제2금속입자를 포함하는 접착제를 포함하는 접착층; 및
방열층의 타면에 형성된 절연성 접착층;을 포함하는 유연성, 내구성 및 전자파 차폐 성능을 갖는 인조 흑연 시트를 이용한 유연성 방열시트.
A mesh-shaped artificial graphite sheet, comprising: a heat dissipation layer having excellent heat transfer characteristics in a horizontal direction in which a mesh inner space is filled with a metal paste, which is an organic material including first metal particles;
A metal thick film layer formed on one surface of the heat dissipation layer;
An adhesive layer comprising an adhesive including a second metal particle having excellent heat transfer characteristics on the metal thick film layer; And
An insulating adhesive layer formed on the other side of the heat dissipation layer; Flexible heat dissipation sheet using an artificial graphite sheet having flexibility, durability and electromagnetic shielding performance.
청구항 1에 있어서,
방열층의 메쉬의 선폭은 0.5 내지 3mm이고,
방열층의 메쉬의 내부폭은 0.5 내지 3mm인 것을 특징으로 하는 인조 흑연 시트를 이용한 유연성 방열시트.
The method according to claim 1,
The line width of the mesh of the heat dissipation layer is 0.5 to 3 mm,
Flexible heat dissipation sheet using artificial graphite sheet, characterized in that the inner width of the mesh of the heat dissipation layer is 0.5 to 3mm.
청구항 1에 있어서,
제1금속입자는 Cu입자, Al입자, Ni가 코팅된 Cu입자, 및 Cu 또는 Ni가 코팅된 폴리머입자 중 하나 또는 이들의 혼합입자를 포함하는 것을 특징으로 하는 인조 흑연 시트를 이용한 유연성 방열시트.
The method according to claim 1,
The first metal particles are Cu particles, Al particles, Ni-coated Cu particles, and a flexible heat-radiating sheet using artificial graphite sheet, characterized in that it comprises one or a mixture of Cu or Ni-coated polymer particles.
청구항 1에 있어서,
제1금속입자 및 제2금속입자는 동일한 것을 특징으로 하는 인조 흑연 시트를 이용한 유연성 방열시트.
The method according to claim 1,
Flexible heat dissipation sheet using artificial graphite sheet, characterized in that the first metal particles and the second metal particles are the same.
청구항 1에 있어서,
접착층은 두께가 5 내지 30㎛인 것을 특징으로 하는 인조 흑연 시트를 이용한 유연성 방열시트.
The method according to claim 1,
The adhesive layer is a flexible heat-radiating sheet using an artificial graphite sheet, characterized in that the thickness of 5 to 30㎛.
청구항 1에 있어서,
절연성 접착층은 두께가 5 내지 25㎛인 것을 특징으로 하는 인조 흑연 시트를 이용한 유연성 방열시트.
The method according to claim 1,
Flexible insulating sheet using an artificial graphite sheet, characterized in that the insulating adhesive layer has a thickness of 5 to 25㎛.
청구항 1에 있어서,
금속후막층은 Al, Cu 및 Ni 중 적어도 하나의 금속을 포함하는 것을 특징으로 하는 인조 흑연 시트를 이용한 유연성 방열시트.
The method according to claim 1,
The metal thick film layer is a flexible heat-radiating sheet using an artificial graphite sheet, characterized in that containing at least one metal of Al, Cu and Ni.
인조 흑연 시트를 메쉬 형상으로 형성하여 수평방향 방열층을 형성하는 단계;
메쉬 내부공간을 제1금속입자를 포함하는 유기물질인 금속페이스트로 채우면서 금속후막층을 형성하는 단계;
금속후막층 상에 제2금속입자를 포함하는 접착제를 포함하는 접착층을 형성하는 단계; 및
방열층의 타면에 절연성 접착층을 형성하는 단계;를 포함하는 인조 흑연 시트를 이용한 유연성 방열시트 제조방법.
Forming an artificial graphite sheet in a mesh shape to form a horizontal heat dissipation layer;
Forming a metal thick film layer by filling a mesh internal space with a metal paste, which is an organic material including first metal particles;
Forming an adhesive layer comprising an adhesive including a second metal particle on the metal thick film layer; And
Forming an insulating adhesive layer on the other surface of the heat dissipation layer; Flexible flexible sheet manufacturing method using an artificial graphite sheet comprising a.
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JPH11251784A (en) * 1997-12-04 1999-09-17 Toppan Printing Co Ltd Electromagnetic shield and production thereof
JP2002026566A (en) * 2000-07-05 2002-01-25 Sumitomo Special Metals Co Ltd Radio wave absorbing panel
JP2005252080A (en) * 2004-03-05 2005-09-15 Fuji Xerox Co Ltd Wave absorber and its manufacturing method
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KR20170115745A (en) * 2016-04-08 2017-10-18 주식회사 영우 Apparatus and method for manufacturing a heat-radiating film using a roll-to-roll process, and a method and apparatus for manufacturing a thermally conductive composite sheet using a roll-to-roll process including the heat-

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JPH11251784A (en) * 1997-12-04 1999-09-17 Toppan Printing Co Ltd Electromagnetic shield and production thereof
JP2002026566A (en) * 2000-07-05 2002-01-25 Sumitomo Special Metals Co Ltd Radio wave absorbing panel
JP2005252080A (en) * 2004-03-05 2005-09-15 Fuji Xerox Co Ltd Wave absorber and its manufacturing method
JP5370752B2 (en) * 2008-06-25 2013-12-18 日立化成株式会社 SUBSTRATE WITH CONDUCTIVE LAYER PATTERN, ITS MANUFACTURING METHOD, AND ELECTROMAGNETIC SHIELDING MEMBER USING THE SAME
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210138253A (en) * 2020-05-12 2021-11-19 대상에스티 주식회사 Manufacturing method of heat dissipation sheet using printing process

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